body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f6fa;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background: linear-gradient(120deg, #3498db, #8e44ad);
    color: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.header h1 {
    margin: 0;
    font-size: 24px;
    font-weight: 500;
}

.logout-btn {
    padding: 10px 20px;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 14px;
}

.logout-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.sidebar {
    position: fixed;
    left: 0;
    top: 70px;
    bottom: 0;
    width: 240px;
    background: white;
    box-shadow: 2px 0 5px rgba(0,0,0,0.05);
    padding-top: 20px;
    overflow-y: auto;
}

.nav-item {
    padding: 15px 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #2c3e50;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-item:hover {
    background: #f8f9fa;
    color: #3498db;
}

.nav-item.active {
    background: #edf2f7;
    color: #3498db;
    border-right: 3px solid #3498db;
}

.main-content {
    margin-left: 240px;
    margin-top: 70px;
    padding: 30px;
} 